Packing for stuffing-boxes.



PATENTED JUN?l so, 1903.

J. IMLALLLUM. PACKING POR STUPPING BOXES.

APPLICATION FILED SEPT. 11, 1901.

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@Nunn Srnrns Patented June 30, 1903.

ATENT OFFICE.

JOHN MCOALLUM, OF IIAREFIELD, ENGLAND, ASSIGNOR TO THE UNI-TED ASBESTOS COMPANY, LIMITED, OF LONDON, ENGLAND PACKING FOR STUFFING-BOXES.

SPECIFICATION forming part of Letters Patent N o. 732,579, dated June 30, 1 903.

lApplication filed September 1l, 1901. Serial No. 75,034. (No specimens.)

To all whom t may concern:

Be it known thatI, JOHN MCOALLUM, a subject of the King of IGrreat Britain, residing at Hareeld, in the county of Middlesex, England, have invented new and useful Improvements in .Packing for Stuffing-Boxes or the Like, of which the following is a specification'.

My invention relates to packings which are made in lengths of fibrous material in combination with metal Wire. Hitherto packings of t-his kind have had the metal combined therewith Yin the form of plates or wire woven or intermixed in such manner that it has been diihcult to bend such packings around pistonrods so as to t the same closely because the metal would not readily yield to the bending.

The object of this invention is to provide packing of asbestos or other fibrous material and metal wire of very simple construction not liable to the metal becoming detached, and so that it may be very easily bent around a piston-rod, and at thesame time the metal will be always kept against the surface of the piston-rod, so as to reduce friction. I attain these objects by constructing packinginthe manner illustrated in theaccompanying drawings, in Which- Figure l is a cross-section of a piece of the packing. Fig. 2 is a longitudinal section at the line A A on Fig. l, showing the layer of metal Wire. Fig. 3 is a View of the face of the packing which is in contact with the piston-rod. Figs. 4. and 5 are cross-sectional and face views, respectively, of a modification of the packing. Figs. 6 and 7 are cross-sectional and face views, respectively, of another modification of the packing; and Fig. 8 is a partial cross-section showing the relation of the piston-rod to the packing.

Like letters indicate similar parts in all the views.

Referring to Figs. l, 2, and 3, a is the fibrous material, which is preferably made up of asbestos or of asbestos together with adhesive orother materials. b is the metal, consisting of a wire, preferablyof lead or other antifrictionmetal, arranged in a zigzag form in a longitudinal plane perpendiculanto the rubbing-face a of the packing and with the apices of the zigzags b alternately presentedtoward and away from the rubbing-face and preferably With the wire as nearly touching as practicable at the points b2, so that as great a surface of metal as possible is presented to the piston-rod or other moving part to be packed'. As shown, the asbestos or fibrous material a. is firstformed as a woven cloth, then folded in several thicknesses, and then bent so as to inclose the metal Wire on both sides and around one edge of the layer atc. The wire maybe secured in the asbestos by adhesive material or by stitching in any convenient way.

Referring to Figs. 4 and 5, in this modification there are two layers of metal wire b, each arranged in zigzag or sinuousform, as above described. The asbestos or fibrous material a is formed in layers and so arranged that there are two grooves or channels a2, in which the metal b is inserted, being secured therein in any usualor convenient manner.

Referring to Figs. 6 and 7, in this modification there are three layers `of metal wire b, all arranged in zigzag form in layers perpendicular to the rubbing-face, as described l above under Figs. l, 2, and 3.

Although I prefer to arrange the fibrous material in the manner shown, my invention is not confined to such arrangement, as the fibrous material may be arranged and secured in relation to the wire in Vany other convenient way as found suitable so long as the Wire is arranged in a zigzag or sinuous form, as described and illustrated. I do not confine myself either to the number of layers of wire, as any number may be used, according to the thickness of packing required or the quantity of metal it is desired to put into a certain section of packing.

By the above arrangements the metal or wire offers no resistance to the bending of the packing around the piston-rod, While at the same time an almost continuous face or faces of metal is or are presented to the rubbingsurface to diminish friction, and by the metal being in one piece parts of the metal are not liable to become detached during handling of the packing, as is the case when the metal is in many separate pieces.

What I claim, and desire to secure by Letters Paten-t, is

1. Asapackingthecombinationwithfibrous material of a layer of metal Wire bent into zigzag form, the inner apices Oi the zigzags being arranged to contact with each other and with the piston-rod and arranged in the fibrous material'in a plane perpendicular and transverse to the piston-rod substantially as described.

2. Asapackingthecombination with fibrous material of several layers Of metal each layer consisting of a Wire bent into zigzag form, the inner apices of the zigzags being arranged to contact with each other and with the pistonrod arranged in grooves in the fibrous material in planes perpendicular and transverse to the piston-rod substantially as described.

3. As a packing the combination with a layer of metal wire arranged in zigzag form, 

